Charges against Fenton include allegations he was illegally in possession of Nitrotain, which contains the anabolic steroid ethylestrenol and is reported to improve the muscle mass, strength and stamina of horses.

Al Zarooni has been charged with breaking doping rules after seven horses tested positive for ethylestrenol and four others showed traces of stanozolol - the steroid used by disgraced sprinter Ben Johnson at the 1988 Olympics.

The former groom has been charged with breaking doping rules after seven horses tested positive for ethylestrenol and four others showed traces of stanozolol - the same steroid used by shamed sprinter Ben Johnson at the 1988 Olympics.

Although the trainer Mahmood Al Zarooni admitted that he had made a 'catastrophic error' by giving anabolic steroids like ethylestrenol and stanozolol to the horses, he, however said he did not realise that what he had done was against the rules as the horses involved were not racing at that time.

BHA director Adam Brickell said that ethylestrenol and stanozolol are anabolic steroids and are therefore prohibited substances under British rules of racing, at any time - either in training or racing.

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